If tan=1/✓5 and theta lies in the first quadrant , the value of cos is
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tan = 1/√5
tan^2 = 1/5
sec^2 - 1 = 1/5
sec^2 = 6/5
sec = √6/√5
cos = 1/sec = √5/√6
tan^2 = 1/5
sec^2 - 1 = 1/5
sec^2 = 6/5
sec = √6/√5
cos = 1/sec = √5/√6
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